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Opcodes - More Opcodes information from opnames.h and opcode.h - metacpan.org
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class="toc-header"><strong>Contents</strong></div> <ul> <li><a href="#NAME">NAME</a></li> <li><a href="#SYNOPSIS">SYNOPSIS</a></li> <li><a href="#DESCRIPTION">DESCRIPTION</a></li> <li><a href="#Operator-Names-and-Operator-Lists">Operator Names and Operator Lists</a></li> <li><a href="#Opcode-Information">Opcode Information</a></li> <li><a href="#SEE-ALSO">SEE ALSO</a></li> <li><a href="#TEST-REPORTS">TEST REPORTS</a></li> <li><a href="#AUTHOR">AUTHOR</a></li> <li><a href="#LICENSE">LICENSE</a></li> </ul></nav> <div class="pod anchors"> <h1 id="NAME">NAME</h1> <p>Opcodes - More Opcodes information from opnames.h and opcode.h</p> <h1 id="SYNOPSIS">SYNOPSIS</h1> <pre><code>use Opcodes; print "Empty opcodes are null and ", join ",", map {opname $_}, opaliases(opname2code('null')); # All LOGOPs perl -MOpcodes -e'$,=q( );print map {opname $_} grep {opclass($_) == 2} 1..opcodes' # Ops which can return other than op->next perl -MOpcodes -e'$,=q( );print map {opname $_} grep {Opcodes::maybranch $_} 1..opcodes'</code></pre> <h1 id="DESCRIPTION">DESCRIPTION</h1> <h1 id="Operator-Names-and-Operator-Lists"><a id="Operator"></a>Operator Names and Operator Lists</h1> <p>The canonical list of operator names is the contents of the array PL_op_name, defined and initialised in file <i>opcode.h</i> of the Perl source distribution (and installed into the perl library).</p> <p>Each operator has both a terse name (its opname) and a more verbose or recognisable descriptive name. The opdesc function can be used to return a the description for an OP.</p> <dl> <dt id="an-operator-name-(opname)"><a id="an"></a><a id="an-operator-name-opname"></a>an operator name (opname)</dt> <dd> <p>Operator names are typically small lowercase words like enterloop, leaveloop, last, next, redo etc. Sometimes they are rather cryptic like gv2cv, i_ncmp and ftsvtx.</p> </dd> <dt id="an-OP-opcode"><a id="an1"></a>an OP opcode</dt> <dd> <p>The opcode information functions all take the integer code, 0..MAX0, MAXO being accessed by scalar @opcodes, the length of the opcodes array.</p> </dd> </dl> <h1 id="Opcode-Information"><a id="Opcode"></a>Opcode Information</h1> <p>Retrieve information of the Opcodes. All are available for export by the package. Functions names starting with "op" are automatically exported.</p> <dl> <dt id="opcodes">opcodes</dt> <dd> <p>In a scalar context opcodes returns the number of opcodes in this version of perl (361 with perl-5.10).</p> <p>In a list context it returns a list of all the operators with its properties, a list of [ opcode opname ppaddr check opargs ].</p> </dd> <dt id="opname-(OP)"><a id="opname"></a><a id="opname-OP"></a>opname (OP)</dt> <dd> <p>Returns the lowercase name without pp_ for the OP, an integer between 0 and MAXO.</p> </dd> <dt id="ppaddr-(OP)"><a id="ppaddr"></a><a id="ppaddr-OP"></a>ppaddr (OP)</dt> <dd> <p>Returns the address of the ppaddr, which can be used to get the aliases for each opcode.</p> </dd> <dt id="check-(OP)"><a id="check"></a><a id="check-OP"></a>check (OP)</dt> <dd> <p>Returns the address of the check function.</p> </dd> <dt id="opdesc-(OP)"><a id="opdesc"></a><a id="opdesc-OP"></a>opdesc (OP)</dt> <dd> <p>Returns the string description of the OP.</p> </dd> <dt id="opargs-(OP)"><a id="opargs"></a><a id="opargs-OP"></a>opargs (OP)</dt> <dd> <p>Returns the opcode args encoded as integer of the opcode. See below or <i>opcode.pl</i> for the encoding details.</p> <pre><code>opflags 1-128 + opclass 1-13 << 9 + argnum 1-15.. << 13</code></pre> </dd> <dt id="argnum-(OP)"><a id="argnum"></a><a id="argnum-OP"></a>argnum (OP)</dt> <dd> <p>Returns the arguments and types encoded as number acccording to the following table, 4 bit for each argument.</p> <pre><code> 'S', 1, # scalar 'L', 2, # list 'A', 3, # array value 'H', 4, # hash value 'C', 5, # code value 'F', 6, # file value 'R', 7, # scalar reference + '?', 8, # optional</code></pre> <p>Example:</p> <pre><code>argnum(opname2code('bless')) => 145 145 = 0b10010001 => S S? first 4 bits 0001 => 1st arg is a Scalar, next 4 bits 1001 => (bit 8+1) 2nd arg is an optional Scalar</code></pre> </dd> <dt id="opclass-(OP)"><a id="opclass"></a><a id="opclass-OP"></a>opclass (OP)</dt> <dd> <p>Returns the op class as number according to the following table from <i>opcode.pl</i>:</p> <pre><code>'0', 0, # baseop '1', 1, # unop '2', 2, # binop '|', 3, # logop '@', 4, # listop '/', 5, # pmop '$', 6, # svop_or_padop '#', 7, # padop '"', 8, # pvop_or_svop '{', 9, # loop ';', 10, # cop '%', 11, # baseop_or_unop '-', 12, # filestatop '}', 13, # loopexop</code></pre> </dd> <dt id="opflags-(OP)"><a id="opflags"></a><a id="opflags-OP"></a>opflags (OP)</dt> <dd> <p>Returns op flags as number according to the following table from <i>opcode.pl</i>. In doubt see your perl source. <i>Warning: There is currently an attempt to change that, but I posted a fix</i></p> <pre><code>'m' => OA_MARK, # needs stack mark 'f' => OA_FOLDCONST, # fold constants 's' => OA_RETSCALAR, # always produces scalar 't' => OA_TARGET, # needs target scalar 'T' => OA_TARGET | OA_TARGLEX, # ... which may be lexical 'i' => OA_RETINTEGER, # always produces integer (this bit is in question) 'I' => OA_OTHERINT, # has corresponding int op 'd' => OA_DANGEROUS, # danger, unknown side effects 'u' => OA_DEFGV, # defaults to $_</code></pre> <p>plus not from <i>opcode.pl</i>:</p> <pre><code>'n' => OA_NOSTACK, # nothing on the stack, no args and return 'N' => OA_MAYBRANCH # No next. may return other than PL_op->op_next, maybranch</code></pre> <p>These not yet:</p> <pre><code>'S' => OA_MAYSCALAR # retval may be scalar 'A' => OA_MAYARRAY # retval may be array 'V' => OA_MAYVOID # retval may be void 'F' => OA_RETFIXED # fixed retval type, either S or A or V</code></pre> </dd> <dt id="OA_*-constants"><a id="OA_"></a><a id="OA_-constants"></a>OA_* constants</dt> <dd> <p>All OA_ flag, class and argnum constants from <i>op.h</i> are exported. Addionally new OA_ flags have been created which are needed for <a href="/pod/B::CC">B::CC</a>.</p> </dd> <dt id="opaliases-(OP)"><a id="opaliases"></a><a id="opaliases-OP"></a>opaliases (OP)</dt> <dd> <p>Returns the opcodes for the aliased opcode functions for the given OP, the ops with the same ppaddr.</p> </dd> <dt id="opname2code-(OPNAME)"><a id="opname2code"></a><a id="opname2code-OPNAME"></a>opname2code (OPNAME)</dt> <dd> <p>Does a reverse lookup in the opcodes list to get the opcode for the given name.</p> </dd> <dt id="maybranch-(OP)"><a id="maybranch"></a><a id="maybranch-OP"></a>maybranch (OP)</dt> <dd> <p>Returns if the OP function may return not op->op_next.</p> <p>Note that not all OP classes which have op->op_other, op->op_first or op->op_last (higher then UNOP) are actually returning an other next op than op->op_next.</p> <pre><code>opflags(OP) & 16384</code></pre> </dd> </dl> <h1 id="SEE-ALSO"><a id="SEE"></a>SEE ALSO</h1> <p><a href="/pod/Opcode">Opcode</a> -- The Perl CORE Opcode module for handling sets of Opcodes used by <a href="/pod/Safe">Safe</a>.</p> <p><a href="/pod/Safe">Safe</a> -- Opcode and namespace limited execution compartments</p> <p><a href="/pod/B::CC">B::CC</a> -- The optimizing perl compiler uses this module. <a href="/pod/Jit">Jit</a> also, but only the static information</p> <h1 id="TEST-REPORTS"><a id="TEST"></a>TEST REPORTS</h1> <p>CPAN Testers: <a href="http://cpantesters.org/distro/O/Opcodes">http://cpantesters.org/distro/O/Opcodes</a></p> <p>Travis: <a href="https://travis-ci.org/rurban/Opcodes/">https://travis-ci.org/rurban/Opcodes.png</a></p> <p>Coveralls: <a href="https://coveralls.io/r/rurban/Opcodes?branch=master">https://coveralls.io/repos/rurban/Opcodes/badge.png</a></p> <h1 id="AUTHOR">AUTHOR</h1> <p>Reini Urban <code>rurban@cpan.org</code> 2010, 2014</p> <h1 id="LICENSE">LICENSE</h1> <p>Copyright 1995, Malcom Beattie. Copyright 1996, Tim Bunce. Copyright 2010, 2014 Reini Urban. 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